Wireless-telegraph transmitter.



L. .DE Pom-m1 WIRELESS TBLEGEAY'H TRANSMITTER.

APPLICATION FLED FEB. 2, TUE-U6.

WTHEKEEE=- INVEHTUF? M///QW J FLM 5&3 454, -t v Patented July 6, i909.

LEE .DE renner, 'or Nnwro-K, Ni.- YL, Assicuoit, :BY MESNEAssIGNMENrrs, `To DEioinisfrf` RamoTELnrH,oivE -co.,ja CoRPoRarIoN or N nw YORK.

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Beit known that l, LEE DE l 7New yYork, .inthe countyof New Yorkand State of New York, have invented a new and useful- Improvement .in Vireless-Telegraph '.llransmitteis, of which .the following vis ai specification". i l ,y 4 My "invention relates .to wireless telegraph transmitting systems. and more especially to `long distanceotrans iitti'ng..systems in which large amountsof electrical energy are radiated in the forni ofelectromagnetic Waves.

One object of my invention is to provide a wireless telegraph transmitting apparatus embodying certain circuital arra igemeiits minimum number of parts. s Tehe drawings which accompany aiidform a part ol this specification illustra-te several embodiments ot' my invention. In the drawings, 4Figure 1 is an elevation, partly` in section, of the preferred torni of my invent-ion; Fig. 2 is aplan view thereof;

, and Fig. Il is a pla'ii view ofa -inodilication- Yii In thefiigures, 1 represents the. outer wall and 2 represents the inner wall of a two-A walled spark-gap mulller` consisting of porce'- lain or other suitable material and provided with lower Ventilating holes, 19, 20, and an upper Ventilating flue formed vby the hollow` bushing 5. The spark electrodes 3,- 4 pass through the inner wall 2 and aresecured to the `outer wall 1, -terminating inv binding posts SQA. The bushing 5 issecuied to the outer wall by the nuts 5', `5', and affords a pivot about which the drum 7 may be rotated; L represents a helixof stout brass or copper, wire nwound upon saiddrum and. secured at its lower end .to the collar 13' which fits over the bushingf, so that the drum and its helix may be rotated andthe latter remain in yelectrical contact '.With the bushing 5. To facilitate the rotation of the drum, the base 8 may be provided with casters which rest uppn the top of the mufherI. i' I 1 1 and lare flats trips of brass oiicopper, secured to the posts 17, 17', respectively,

. j speqifieaeinqf Letters Patent.,y i Applicationileid Aliiefbruai' 2, 190,6,` Serial 11.9.1299,099.

- Patented Juiyfe, 1909.Y

helix which are included in the antennaand `intheclosed oscillatingfcircfuit, and there-` fore,v the vinductance `of these elements, may' s imtilt'aneouslyfbevaried. The antenna is connected to thezpost 17 andthe lead to earth is connected t-itlie 'post 3'-, in which .the sparkelect-rode terminates.

Which 'embrace the :helix- Ly s that b the rotation of the latter, Athe amountso saidV Y' C, C represent condensers of any suitable type, such for examplmas plate condenseiys consisting of nietallicplatcs, or else tin-foil v mounted on glass plates, immersedin oil or other suitable dielectric.. shown in '1, t'wosuch condensers connected in series may be employed.

ln long-distance graph' systems,- there fis one niostetlicient arrangement of# .the spark. gap, the. condenser l1'and thehelix, and wlienthis arrangement' has been foundf but little `adjustnient-or varia'- .tion of the apparatus is necessary. There- .length' of spark-gap, the' size of the condensers,. and the amountof inductaiice 1neluded in the vantenna and oscillating circuit- .are practically hired. from the dynamo, or other prinie sf urce ok' ln order; to .absorb .,eiiei'gy,l the maximum aiiiouiit of energy, thel capacit-,y of the condensers, other 'things be# higlrpower wireless telefore'in the apiaaratus herein described the ing equal, should be as large possiblefora v given frequency, and it is desirable that all should be concentrated in the helix and not distributed throughout the leads. minimum limit to the amount of inductance in the oscillating circuit is interposed by the necessity for efficient linkage between said the inductanceoi said oscillating circuit Hence all the inductance existing in the leads-serves only vtowredvuce theV A certain 'capacity of the condenser which maybe einployedin the oscillating circuit.

In order to render possible the employ- 'nient of a condenser ot maximum capac4ty`1 for a given frequency, l make the leads lin r oscillating circuit of relatively large wire,A or

ofv flat strips, of brass or copper and ofthe shortest possible length, so that said leadsshall have veryr small and practically neglil gible inductance as compared-With thatgof, the helix. Accordingly, 'I mount the helix.

on top ofthe muffler and connect the'lotifer end 12 of the helix which is' connected. tothe CollarfS to'the top of theeleotrode 3 .by short conductorv 'and connect the'. 'electrode 14,"

through thepost 4.', and conductor-10 t'oouef' vterminal of the condenserC'Whioh is placed in close proximity to the muffler, Whilefthe other terminal of the condenser GisV connected to one terminal of' condenser C',- ar-A ranged alongside of C and'alsoi-in closel proxunity to the muffler.

y the'conductory l1.' lt will'thus'jbe seen shoWIlLin'Fig'.A Las Well as thesi'zeand shape of the leads employed', produces an oscillating circuit inwhich praeticallyall the inductanceY lies in the helix. lf" three co'ndense'rs in seriesare employed, lprefer lto'connect them inthe delta arrangementshown inJFig. 3.

' lnvlong distance commercialwireless telegraph transmitting. systems', the apparatus is standardized, vso that when the apparatus I hasabeen once installed Very little adjust#v ment is needed. However what adjustment is "rendered-necessary by varying conditions, .as Welll as the initial adjustment, is afforded by the slight rotation of the drum 7,;2by' which rotationthe natural`- periods of the an-" tenna'and closedr oscillating circuit may be made equal.A

l. donot wishto be limited to the exact 'construction or arrangement of parts shown" hereinv inasmuch as many variations may be made therein Without departing4 from the@ spirit of-myinvention.` y

lclaim:

l. ln awreless telegraph 'transmitten' spark' electrodes,."a double-Walled ventilated' The circuit is "completed by ashortconnection from Cf to 17 :and 15` 4 that. the compact arrangement .of apparatus muflier inc losing the same, .a' helix'mounted 'i i' v on *sa'd -muHi-er' andv electrical connections" A i'romsaid' electrodes to saidlh'elix.

1 Inl] al" -yvireless telegraphjtransmitter 'Spark electrodes, .doubleewalled Ventilated muiilerir'iclo'sing the same, a rotatable helix mounted .von 'said muffler and-electrical con-' infections-from said .electrodes to said hel-ix.

spark electrodes, a nulerinclosingthe same, a rotatable helix mounted on sald mulllerfan 31H1 f' a IWireless telegraph transmitter,

electrical connectionfi'om oneof saidy spark electrodes to one end fof ysaid helix, .-a"con-A ductingfmei'nber'adapted toztrayela'long said helix when the latter isrot'ated, an electrical A connection 'from said y"member to theother of said spark eleetrodesad a plate ondenser 'included insai'd 'electrical connections.

4. In a Wireless telegraph. transmitter, spark electrodes, a mulier inclsing the'same,

a bushing fixed toand extending through the upper Wall of said muiiler, a drum'pivoted to vsaid. bushing Yby a collar making electrical .Contact therewith., and a helix mounted on said drum and .electrically connected with said collar. i y c 5.- In' a Wireless telegraph transmitter, ,spark electrodes, a double-Walled muffler inelo'sing the same, abu'shing fixed to the outer l Wall and extending through the inner Wall ol said muHier, a ydrum pivoted to -said bushingv` by a collar making electrical Contact therewith", and a helix mounted onsaid drum and 

